Power Plant Emergency
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Transcript of Power Plant Emergency
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7/29/2019 Power Plant Emergency
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POWER PLANT EMERGENCY
Every power plant generation unit or station tried to supply quality and reliable
power to grid or customer. So after commercialization of unit, the operation engineersresponsibility increased manifold not only providing the quality and reliable power
supply but also safety of all running equipments and unit.
Operation engineers familiarized with problems and emergencies. Familiarization of all
emergency is needed, some problems can be solved easily without losing generation.
But some unforeseen incidents occurred in power plant. It requires immediateappropriate action to solve problem to avoid any generation loss or any damage to
equipment.
So, there are different type of emergencies
1. Boiler emergencies
2. Turbine emergencies3. Generator emergencies
4. Electrical emergencies ( SWGR)
5. Grid failure.
6. Unit emergencies
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Unit emergencies:-
1. CW P/Ps tripped
2. Compressor tripped
3. Heavy lkg in DM make up line
4. Any major fire in oil system of TDBFP /Main TG etc
5. Failure of work station
6. Loss of 220 V DC
7. Loss of 24V TG8. Loss of 24V SG
9. UPS failure
10. 11 KV SWGR dead
11. 3.3 KV SWGR dead
12. USS/Unit Emergency SWGR dead
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CW P/P tripped
Unit/ Station condition
All units running with 500 MW4 CW P/Ps are running
I/C V/Vs are opened
Case-1 : One CW P/P tripped
Consequence:-
suction pressure low to ACW P/P
Low flow through Condenser Pass-A/B
Temp may rise of TG PHE O/L results increasing oil/Brg temp, seal oil temp,
Action:
Start stand by pump immediately
Observe all parameters
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Case-2 : One CW P/P tripped and stand by p/p failed to start CW P/P-3B/3C tripped due to dead of 3UB busCW P/P-3B/3C tripped due to dead of 3UB bus and another p/p fails to startor under PTW
Consequence:-
Suction pressure low to ACW P/P
Low flow through Condenser Pass-A/B
Temp may rise of TG PHE O/L results increasing oil/Brg temp, seal oil temp,
Action:
Start stand by CW P/P
Reduce unit load around 300 MW
Observe condenser vacuum and all Brg and oil temp
If necessary, throttled TGPHE ACW side v/v to avoid ACW P/P tripping
If tripping of any unit due to temp like seal oil or PW etc, Close the
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DM Water System
Unit/ Station condition
All units running with 500 MW
Avg make up around 25-30 T/H to hot well
ECW tank make lined from DM
Normal/emergency make up lined up
Case-1Leakage in DM header ( DM make up system isolation required)
Consequence:
Hindrance to DM make up to units wastage of DM water
Action:
Take DM water make up to ECW O/H tank in all units
Take up make up in Hotwell and DA and maintain above normal level
Start emergency make up system and check /ensure flow to Hotwell
Isolate all units of Hotwell normal make V/v tp avoid air ingress
Stop soot blowing of all units for that time
Inform chemsitry SCE for not taking DM for CPU regenartion
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Compressor- Instrument air system
Unit/ Station condition
All units running with 500 MW
All Compressors are running
I/C V/Vs are opened 10% at stage one end and full opened at stage-II end.
Power Source of Compressor- Unit-3 (IAC-1,3,5, PAC-1)Unit-4( IAC-2,PAC-4)
Unit-5( IAC-4,PAC-3,5)
Unit-6( PAC-2,6)
Cooling water sources:- IAC-1-5 and PAC-1-4 from all units
and IAC-1-5 and PAC-1-4 from unit-5/6 ( stand by)
PAC-5,6 from unit 5 and 6
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Case-1
Few IAC tripped due to some protection leads to maintain low header pressure
Consequence:
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SL.NO NTPC TAG SERVICE ACTION
1CD-67 COND SPRAY TO HDFT MODULATING
SD-62 BCW LP DRAI MANIF DRAIN V/V ON/OFF
2DR-18 HPH-5A DRAIN TO HPFT CV
MODULATING
AIR TO CLOSE
3DR-25 HPH-5B DRAIN TO HPFT CV
AIR TO CLOSE
4DR-5 HPH-6A DRAIN TO HPFT CV
5DR-11 HPH-6B DRAIN TO HPFT CV
6DR-31 LPH-3 DRAIN TO LPFT C/V
7DM-1 DM N M UP TO HOTWELL C/V
8DR-15 HPH-5A DRAIN TO D/A CV
MODULATING
AIR TO OPEN
9DR-22 HPH-5B DRAIN TO D/A CV
AIR TO OPEN
10DR-28 LPH-3 DRAIN TO LPH-2 C/V
11DMCW-90 ECW PUMP(SG) I/O HDR DP C/V
AIR TO OPEN
12SD-61 BCW ECW LINE INLETV/V
ON/OFFAIR TO OPEN
13SD-62 BCW LP DRAI MANIF DRAIN V/V
AIR TO OPEN
14DR-37 LPH-2 DRAIN TO LPFT C/V MODULATING
AIR TO CLOSE
15DR-48 D/A OVERFLOW LPDFT ON/OFF
AIR TO CLOSE
16CD-10 CEP-A M/N R/C C/V
MODULATING
17CD-12 CEP-B M/N R/C C/V
18CD-14 CEP-C M/N R/C C/V
AIR TO CLOSE
19CD-39 GSC M/N R/C C/V
20CD-43 HOTWELL SPILL LVL C/V
AIR TO CLOSE
21DR-2 HPH-6A DRAIN TO HPH-5A CV
MODULATING22
DR-8 HPH-6B DRAIN TO HPH-5B CV
23DR-34 LPH-2 DRAIN TO LPH-1 C/V
AIR TO OPEN
24DM-2 DM E M UP TO HOTWELL C/V
AIR TO OPEN
25SD45 SH SPRAY C/V LEFT
MODULATING
Air to Open
26
SD44 SH SPRAY C/V LEFT
Air to Open
27SD46 SH SPRAY C/V RIGHT
Air to Open
28SD47 SH SPRAY C/V RIGHT
Air to Open
33AS-8 AUX STEAM TO D/A C/V MODULATING
29FD14 LOW LOAD FEED C/V MODULATING
30CD-22 D/A LVL C/V MAIN
MODULATING
Air to Open
31CD-25 D/A LVL C/V STANDBY
Air to Open
32DMCW-100 ECW PUMP(TG) I/O HDR DP C/V
Air to Open
34CRH-6 CRH STEAM TO D/A C/V MODULATING
Air to Open
35CD-72 GLAND SEALING C/V MODULATING
36SD-43 SH SPRAY BLOCK V/V ON/OFF Air to Open
SD-48 RH SPRAY BLOCK V/VON/OFF
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An emergency power system/ stand by is anindependent power generation system that is
legally required to feed equipment or systems
whose failure may present a life safety hazard
to persons or property.
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FAILURE OF UPS
AC
( Inverter)
LOAD
AC(Inverter)
DC(Rectifier)
DC(Rectifier)
AC supply ,USSAC supplyEMCC
Bypass AC supplyUSS
Bypass AC supplyEMCC
Battery Bank
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ACPDB-01 (CCR)
ACPDB-02 (CCR)
ACPDB-03 (PRGMR ROOM)
ACPDB-04(UCP)
ACPDB-05 C&I-MAINT
ACPDB-06 CHIMNEY
BHEL PDB-1 MTM
BHEL PDB-2 MTM
BHEL PDB-4 AIR HEATER
SWAS
PA SYS 01
PA SYS 02
VMS-CER
MASTER CLOCK CER
ACPDB-11 BNKR LVL
PAH-A AIR MOTOR BMCC
PAH-B AIR MOTOR BMCC 3.3R 2.2R
SAH-A AIR MOTOR BMCC 2.4R
SAH-B AIR MOTOR BMCC 4.3R
VMS-II CER
SG/TG MMI WS POSE CAB
BOILER FLAME SENSING SYSTEM
ACCOUSTIC PYROMETER
BLR MAIN WORK STATION
BPOS
VIB ANALYSER
GCC02 SEAL OIL ISNT CAB
GCC03 STATOR WATER INST. CAB
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STATOR END WNDG VIB SYS
VFD C&I PANEL ID-A
VFD C&I PANEL ID-B
TUBE LIFE ASSESMENT SYSTEM
CJJ13 MARSHELLING PANEL
TSI FOR BFPDT 1&2
TSC PC & PRNTR.
GAS ANALYSE
PDB FOR APRDS CJCB
PARTIAL DISCH. MONITORING
MDBFP SCOOP KE3
ACPDB-19 BRNR TILT
ACPDB-21 HPH LVL SW
ACPDB-22 LPH LVL SW
ACPDB-23 D/A LVL SW
ACPDB-24 HOTWELL LVL SW
BHEL PDB-3 BCW P/P
CWPNL VMS
FLAME SCANER CJF-07
VAC. P/P -1
SMART ACT. STN (U#3 ONLY)
MILL A TO E LVL SW ACPDB
MILL F TO K LVL SW ACPDB
MILL REJECT SYSTEM
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Case-1
In case of any one channel failed to supply power, supply will getextend from the other source and alarm will come. No problem is
envisaged.
In case of both channel failed to supply, then direct sources (
unregulated 415V AC Power) comes in service, no immediate
problem will occur but regular supply has to be restored as soon aspossible.
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Case-2
If there is total failure of power supply from UPS, the following events will happen
All BFP will get trip on D/A level-Low since supply of DA Lvl switch from UPS
Boiler will trip on All BFP OFF from FSSS ( SG 24V source)
Turbine will trip on MFT of boiler and generator will trip on Low Forward Power
ID fans will trip due to loss of supply from UPS to VFD, FD fans will trip on interlock
Mills and PA fan will trip on MFT
No command will be executed from MMI and parameters will not be available for
BHEL CRT, For DDCMIS, HMI/LVS screens will be available for 30 mins
Vertical panels will be available for operation.
Turbine lube oil pumps. Seal oil pumps, barring gear will be available
HP/Lp bypass will be available for operation
TSI parameters will not available.
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Action
Ensure by checking at local, Main TG, TDBFP lube oil pumps, seal oil
pumps, air pre heater motors, scanner air fans etc are in service. And check
barring gear v/v opened.
Inform C & I and EMD ( battery and Charger group) for
rectification.SCE/DGM/AGM(O)
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FIRE NEAR TG ON ACCOUNT OF OIL LEAKAGE
OR FIRE IN LUBE OIL SYSTEM/TDBFP/MAIN TG
CASUE
Oil lkg in pipe line, bearing etc
Wet cotton which was used for cleaning purpose filter or bearing
Above these, high temp of steam lkg and contact with bared high
temp steam line.
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ACTION
Oil fire spread very fast, so that
machine should be stopped
immediately
Oil supply should be cut off, DC oil
pump should kept off.
Steam supply should be cut off.Incase of towards , Main TG
trip main TG, H2 purged out.
Extinguish fire with help of available
of fire extinguisher
Inform to fire station
Inform HOD of OPRN/EMD/TMD
Revise DC
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Fire protection-1
Generator breaker OFF andEither MOT Lvl V Low or Fire protection
PB(1/2) pressed
Casue
Opens the vacuum breaker on protection
Stops the HPCF pumpsStops HPCF heater
Stops HPCF recirculation pumps
Trips the turbine
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Fire protection-2
Either MOT Lvl V Low or Fire protection
PB(2) pressed
Cause
Switch off the SGC oil supply program
Stops AOP-1 on protection
Auto off SLC AOP-1
Stops AOP-2 on protection
Auto OFF SLC AOP-2
Auto On SLC EOPAuto OFF SLC jOPs
Stops JOP-1 on protection
Stops JOP-2 on protection
Starts JOP-3 on protection
Auto OFF SLC JOP-3
Auto OFF SLC turning gearTrips the turbine
Opens the vacuum breaker on protection
Stops the HPCF pumps
Stops HPCF heater
Stops HPCF recirculation pumps
Trips the turbine
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SL.NO NTPC TAG SERVICE ACTION
1CD-67 COND SPRAY TO HDFT MODULATING
SD-62 BCW LP DRAI MANIF DRAIN V/V ON/OFF
2DR-18 HPH-5A DRAIN TO HPFT CV
MODULATING
AIR TO CLOSE
3DR-25 HPH-5B DRAIN TO HPFT CV
AIR TO CLOSE
4DR-5 HPH-6A DRAIN TO HPFT CV
5DR-11 HPH-6B DRAIN TO HPFT CV
6DR-31 LPH-3 DRAIN TO LPFT C/V
7DM-1 DM N M UP TO HOTWELL C/V
8DR-15 HPH-5A DRAIN TO D/A CV
MODULATING
AIR TO OPEN
9DR-22 HPH-5B DRAIN TO D/A CV
AIR TO OPEN
10DR-28 LPH-3 DRAIN TO LPH-2 C/V
11DMCW-90 ECW PUMP(SG) I/O HDR DP C/V
AIR TO OPEN
12SD-61 BCW ECW LINE INLETV/V
ON/OFFAIR TO OPEN
13SD-62 BCW LP DRAI MANIF DRAIN V/V
AIR TO OPEN
14DR-37 LPH-2 DRAIN TO LPFT C/V MODULATING
AIR TO CLOSE
15DR-48 D/A OVERFLOW LPDFT ON/OFF
AIR TO CLOSE
16CD-10 CEP-A M/N R/C C/V
MODULATING
17CD-12 CEP-B M/N R/C C/V
18CD-14 CEP-C M/N R/C C/V
AIR TO CLOSE
19CD-39 GSC M/N R/C C/V
20CD-43 HOTWELL SPILL LVL C/V
AIR TO CLOSE
21DR-2 HPH-6A DRAIN TO HPH-5A CV
MODULATING22
DR-8 HPH-6B DRAIN TO HPH-5B CV
23DR-34 LPH-2 DRAIN TO LPH-1 C/V
AIR TO OPEN
24DM-2 DM E M UP TO HOTWELL C/V
AIR TO OPEN
25SD45 SH SPRAY C/V LEFT
MODULATING
Air to Open
26SD44 SH SPRAY C/V LEFT
Air to Open
27SD46 SH SPRAY C/V RIGHT
Air to Open
28SD47 SH SPRAY C/V RIGHT
Air to Open
33AS-8 AUX STEAM TO D/A C/V MODULATING
29FD14 LOW LOAD FEED C/V MODULATING
30CD-22 D/A LVL C/V MAIN
MODULATING
Air to Open
31CD-25 D/A LVL C/V STANDBY
Air to Open
32DMCW-100 ECW PUMP(TG) I/O HDR DP C/V
Air to Open
34CRH-6 CRH STEAM TO D/A C/V MODULATING
Air to Open
35CD-72 GLAND SEALING C/V MODULATING
36
SD-43 SH SPRAY BLOCK V/V ON/OFF
Air to OpenSD-48 RH SPRAY BLOCK V/V
ON/OFF